William h



(No Model.)

W. H. & O. E. HART.

DRIVE CHAIN. No. 488,808 v Patented Dec. 27, 1892,.

WILLIAM H. HART AND CHARLES E. HART, OF NEW BRITAIN, CONNECTICUT,

PATENT OFFICE.

ASSIGNORS TO THE STANLEY WORKS, OF SAME PLACE.

DRIVE-CHAIN.

SPECIFICATION forming part of Letters Patent No. 488,808, dated December 27, 1892.

Application filed August 8, 1892.

To all whom it may concern.-

Be it known that we, WILLIAM H. H RT and CHARLES E. HART, citizens of the United States, residing at New Britain, in the county of Hartford and State of Connecticut, have invented a certain new Improvement in Drive-Chains, of which the following is a specification.

Our invention relates to improvements in drive chains as formed of sheet metal, and the principle. object of our improvement is economy in stock and general simplicity and economyin construction by which we produce a superior article.

In the accompanying drawings, Figure 1 is a plan view of a single link of our drive chain. Fig. 2 is an edge view of the same. Fig. 3 is a plan view of the blank from which we form our link together with the contour of part of anotherblank,illustratingthe manner of cutting the same without waste of stock. Fig. 4 is a transverse section of the pintle portion of our link on the line a; x of Fig. 1. Fig. 5 is a sectional view of the same on the line y 11 of Fig. 1, and Fig. 6 is a like view with a modified form of-pintle.

The general form of our link is old and the chain is of the class where the links are designed to be placed together by slipping the pintle portion into the hook or knuckle por tion, when two links are brought into a certain position with reference to each other, as is well known by those familiar with this class of links. We make the blanks with a tongue 7 for forming the hook or knuckle portion and extending therefrom are the side bar blanks 8 8 with their disconnected ends opposite. the knuckle blank. They are made a little longer than the side bars 9 of the completed link so that the ends of these blanks 8 may be rolled over or coiled into pintle eyes 10 as best shown in Figs. 1 and 2. This permits us to cut the knuckle blank for another link and the rectangular pintle blank 12 from between the ends of the side bar blanks 8 8 as illustrated by the broken line contour at 11 in Fig. 3. The knuckle blank maybe rolled or coiled into the knuckle B in any ordinary manner and the free ends of the blanks 8 8 as before described are rolled into the pintle eyes 10. The rectangular blank which is cut from Fig. 3 at 12, is also rolled or coiled into the pintle portion 14, and placing it between eyes 10 10, it is Serial No. 442,392. (No model.)

secured therein by means of the pin 15 that extends through both of said eyes and the pintle portion 14, by riveting or heading its ends.

While we prefer to form the pintle 14 from a blank cut out as at 12 so as to economize in stock, we may sometimes form the same of a solid tube or we may form a pintle portion 144. with trunnions 155 all in one piece of metal and secure it in position with the trunnionsin the eyes 10 of the pintle portion as shown in Fig. 6.

By our improvement we make alink of sheet metal with substantially no waste of stock. We are also enabled to bring the seam of the pintle portion,,wnen it has a seam, at a point one side of the bearing line where it is subjected to the most wear in use. In other words, the seam of the pintle is not in the line of the draft on the chain. We are also enabled to make the pintle of either a large or small diameter as may be desired.

While we have a chain link with the side bars and knuckle portion formed of a single thickness only, it is evident that our improvement isalso applicable to links where said parts are formed in two thicknesses or to a link in which the side bars are formed in a single thickness and the hook or knuckle portion is formed of two thicknesses.

We claim as our invention,

The herein described drive chain link consisting of ahook like knuckle portion an dintegral flattened side bars with the ends thereof which are farthest from said hook like knuckle portion rolled or coiled into eyes 10 the exterior diameter of which eyes correspond with the inner diameter of said hook like knuckle portion, and a separately form ed pintle piece the end portions of which are fitted to and secured within said eyes While the portion of said pintle which lies between them is of a diameter equal to the exterior diameter of said eyes, substantially as described and for the purpose specified.

' WM. H. HART.

CHARLES E. HART.

Witnesses for Wm. H. Hart:

EDWARD H. HART, WALTER H. HART.

Witnesses for Chas. E. Hart:

G. S. REYNOLDS,

F. H. MARSH. 

